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Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses

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2009_Dekorsy_PhysicalReviewB.pdf
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2009

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Hudert, Florian
Issenmann, Daniel
Mlayah, Adnen
Huntzinger, Jean-Roch

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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-86968
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https://doi.org/10.1103/PhysRevB.79.201307
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Physical Review B. 2009, 79, 201307. Available under: doi: 10.1103/PhysRevB.79.201307

Zusammenfassung

In this Rapid Communication we report the first time-resolved measurements of confined acoustic phonon modes in free-standing Si membranes excited by fs laser pulses. Pump-probe experiments using asynchronous optical sampling reveal the impulsive excitation of discrete acoustic modes up to the 19th harmonic order for membranes of two different thicknesses. The modulation of the membrane thickness is measured with fm resolution. The experimental results are compared with a theoretical model including the electronic deformation potential and thermal stress for the generation mechanism. The detection is modeled by the photoelastic effect and the thickness modulation of the membrane, which is shown to dominate the detection process. The lifetime of the acoustic modes is found to be at least a factor of 4 larger than that expected for bulk Si.

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530 Physik

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ISO 690HUDERT, Florian, Axel BRUCHHAUSEN, Daniel ISSENMANN, Olivier SCHECKER, Reimar WAITZ, Artur ERBE, Elke SCHEER, Thomas DEKORSY, Adnen MLAYAH, Jean-Roch HUNTZINGER, 2009. Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses. In: Physical Review B. 2009, 79, 201307. Available under: doi: 10.1103/PhysRevB.79.201307
BibTex
@article{Hudert2009Confi-9195,
  year={2009},
  doi={10.1103/PhysRevB.79.201307},
  title={Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses},
  volume={79},
  journal={Physical Review B},
  author={Hudert, Florian and Bruchhausen, Axel and Issenmann, Daniel and Schecker, Olivier and Waitz, Reimar and Erbe, Artur and Scheer, Elke and Dekorsy, Thomas and Mlayah, Adnen and Huntzinger, Jean-Roch},
  note={Article Number: 201307}
}
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